Year 10 universe

What role do elements created in stars play in planet and life formation?

• They are harmful to life
• They only affect the formation of planets
• They are essential building blocks
• They have no role

What may form from the remnants of a supernova?

• A black hole
• A galaxy
• A planet
• A new star

What is the first stage in the star cycle?

• Red giant phase
• Supernova
• Main sequence phase
• Nebula

What is a nebula?

• A small star
• A planet
• A black hole
• A large cloud of gas and dust

What is the longest stage in the star cycle?

• Main sequence phase
• Red giant phase
• Nebula
• Supernova

How do neutron stars and black holes differ?

• Black holes emit light while neutron stars do not
• Neutron stars are larger than black holes
• Black holes are denser than neutron stars
• Neutron stars have weaker gravity than black holes

What process produces energy in stars?

• Nuclear fusion
• Nuclear fission
• Chemical reactions
• Gravity

What is the relationship between the star cycle and the evolution of the universe?

• The star cycle is the cause of the universe's evolution
• The star cycle is a result of the universe's evolution
• The star cycle is a constant reminder of the universe's evolution
• There is no relationship

What stage of the star cycle is our Sun?

• Black hole
• Neutron star
• Main sequence
• Red giant

What is the estimated percentage of the universe's total mass that is made up of hydrogen?

• 75%
• 50%
• 25%
• 100%